Outlander showrunner Ron Moore has been dropping hints on Twitter and in interviews about what is happening with Season Three which will be adapted from the book Voyager. Some of these you might know and some you might not. Spoilers will be well marked.

Non-Spoiler

Filming of Season 3 will start in Late August or Early September.

Filming will continue in Scotland for at least Season 3.

No new characters have been cast for S3.

Part of S3 won't take place in Scotland.

Right now they are planning 13 episodes for S3 & S4 but that is subject to change.

Jamie and Claire will brave a ship again.

According to Ron Moore, the book Voyager is already proving easier to adapt than Dragonfly in Amber which S2 was adapted from.

Next Season there will be some new writers: Luke Schelhass, Karen Campbell, Joy Blake & Shannon Goss.

SPoilers

The most challenging part of filming Season 3 will be the stuff in the Caribbean.

Ron is looking forward to casting Young Ian and Adult Fergus.

The Outlander crew is looking for locations in Scotland that look like Jamaica and Hispaniola.

Ron is considering taking some production to South Africa to possibly film ship from Black Sails. Saving Starz money since 1715.

Sam and Cait will be "aged" and not recast because honestly, that would just be stupid at this point.